I've found that I can run a lot faster for longer on a treadmill. Wheras I do 2X10 min tempo runs at about 3:20 pace, I'm able to run about 3 min ks with about the same effort. Obvioiusly the treadmill is helping me to run faster. Two questions: 1) do others have a similary experience? 2)All things equal, would I be better off with treadmill running (which I do a lot in bad weather) or I should tough it out and hit the streets in the heat/cold/rain/snow. Thanks in advance.